OPTICS-1000 silica-Lr

The initial reaction of the silica with the diammonium molybdate in such acidic conditions ensures that only the B-molybdosilicic acid is formed. Then the solution is treated with tartaric acid to destroy the phosphomolybdic acid, which is formed under the same conditions. Finally, the molybdomolybdic acid is reduced to the molybdenum blue complex, which absorbs at 810 nm. If some of the B-silicomolybdic acid is formed the molybdenum blue reduction product of this form absorbs at a lower wavelength, near to 730 nm. Hence, it is important to ensure that only the B-isomer be formed in the initial stage.

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